Pneumatic pump



May 5, l 925.

VH.SROGERS PNEUMATIC PDM? Filed Feb. 20, 1922 3 @Ll y WM ATTORNEYS.

Patented May 5, 1925.

I'IOMER S. ROGERS, OF MILWAUKEE, WISCONSIN, It-SIGNOR TO MLVJAUKEE AIRPOWER PUlVIlE` COMPANY, F IVIILWAKEE, WJKSOONSIN, A CORPORATION 0F WIS-CONSIN.

ENEUMATIC PUMP.

Application inea February 20,1922, seriai No. 537,807.

T 0 @ZZ @07mm t may concern.'

Be it Vknown that I, Heinen S. Roenes, a citizen of the United States,residing at j Milwaukee, in the county of Milwaukee and State o1'llliscoiisiii, have invented certain new and useful In'iprovements inPneumatic Pumps, of which the following is alspeciiication, referencebeing had to the accompanying drawing, forming a part thereof. Thisinvention relates to pneumatic pumps and the object of the invention isto iinprove thev construction and operation of pneumatic pumps in themanner to be here j inafter described and claimed. 4 VReferring to thedrawing which accompanies this specification and forms a part hereof,the ligure of the drawing is a vertical section of a pneumatic pump.

Referring tothe drawing, the reference numeral 1` designates a pumpchamber which is provided with a water inlet valve 2, a water outletvalve 3, an air admission `valve L1, and an air exhaust valve 5. Thedrawing illustrates the parts in the positions which they occupy whenwater is being forced from the pump chamber, by coinpressed air,`through the water discharge pipe 6. The air exhaust valve 5 is heldagainst its vseat 7 by a spring 8 which is sulliciently powerful to holdthe air exhaust valve 5closed against any air pressure to be `used inthe pump chamber 1. A belli `crank lever 9 is pivoted to the head 10 ofthe pump by a pivot 11 andone of its arms is pivoted to the air exhaustvalve v5 while its other arm is pivoted to the stem 12 which projectsfrom the plunger 13, as clearly shown bythe drawing. The stem 12 may bepositioned and guided by aweb `11 and a recess `15 in a head or cap 16.The spring 8 is illustratedby the `drawing as a spiral spring oftheopen, orcompression, type surrounding the stem 12 and bearing at one endagainst the web 141 and at its other end against the -plunger 13 andexerting sufficient pressure to keep the air exhaust valve 5` closedagainst thev pressure of the air `in the pump chamber 1. The spring 8 iscompressed to the requisite degreeof ten sion when itis assembled withthe parts `of the pump with which `it coacts and its expansion islimited by the air exhaust valve seating against its seat 7. The spring8 can be compressed, .and the air exhaust valve 5 opened, by afluid-pressure motor 17, which is illustrated by the `drawing ascompris? ing a diaphragm 18 and a head 19, between which is a fluidchamber 20, when the water level iii the pump chamber 1 has been loweredto a predetermined level.

It should be particularly noted that the plunger 13 does not encounterany obstacle to its continued movement under the influence of the spring8 towards the right, looking at the drawing, so that the air exhaustvalve 5 will be firmly seated even though wear takes place or the valvefacing 21 swellsor shrinks under different conditions. vThe fluidchamber 2O can be placedin communication with the lower part of the pumpchamber 1 by avalve 22 which can close or open the lower end of a pipe23 which communicates with the fluid chamber 20. The valve 22 is carriedby a valve lever 2li which is pivoted by a pivot 25 to the lower end ofthe pipe 23.V A float 26 is arranged as a low level float and has a stem27 projecting through a hole in a guide 28 and another stem 29projecting through a hole in the valve lever 211. rl`he stein 29 has ahead 30 below the valve lever 2a so as to close the valve 22 as the `ofthe spring 8 is sulhcient to keep the air exhaust valve 5 closed, aswill be readily iinderstood from the well-knownprinciples of thepressures of fluids upon surfaces or areas differing in size.

projecting downwardly through a guide 33. Toggle-joint members `34 and35 are piv-` oted together by a pivot 36 and the member `311is pivotedto the stem 32 of the air exhaust valve 5 by a pivot 37, while the inem`ber 35 is pivoted to a projection 38 by ,aV

pivot 39. The projection 38 is illustrated by the drawing as formedintegrally with the head 10 of the pump but this specific constructionis immaterial as the only ob-` ject sought is to support the pivot 39firmly substantially under the pivot 37. rllhe construction forms atoggleqoint which will hold the air exhaust valve 5 open when the Theair exhaust valve 5 y is illustrated as provided with a stem 32 pivot 36is moved into a substantially straight line with the pivots 37 and 39.1t is preferred that the pivots 36, 37 and 39 lit a little loosely sothat, when the air exhaust valve is lifted, the spring 40 can swine' thepivot 36 slightly beyond a line through the pivots 37 and 39 against astop and thus hold the air exhaust valve 5 open. The stop illustrated bythe drawing is the stem 41 which projects from a head 42 which restsagainst a part of the head of the pump but can be forced away therefromby any suitable motor mechanism, as for example, the diaphragm 43 of afluid pressure motor 44. rl`his fluid pressure motor 44 is provided witha tluid chamber 45 to which compressed air can be admitted from a duct46 by an air valve 47 and from which the compressed air can be exhaustedthrough an exhaust port 43 which is controlled by the exhaust valve 49.For simplicity of construction the air valve 47 and the exhaust valve 49may be formed on a member 50 which is provided with a stem 51 connectedLto a lever 52. The lever 52 is pivoted by a pivot 53 to the stem 51, andby a pivot 54 to the head 1() of the pump, and by a pivot 55 to aweight-float 56. The weight-float 56 should be heavy enough to keep theair valve 47 closed against the pressure of the compressed air in theduct 46, taking into account the leverage exerted by the lever 52, whenthe water level in the pump chamber 1 is not high enough to buoy up theoat 56, and, at the same time, the float 56 should be light enough sothat when it is buoyed up by the water the air valve 47 will be openedand at the same time the exhaust valve 49 will be closed so that thepressure of the compressed air in the Yluid chamber 45 will bulge thediaphragm 43 and move the head 42 and stem to push the pivot 36 of thetoggle-joint members 34 and 35 beyond a line through the pivots 37 and39 so that the spring- 8 can close the air exhaust valve 5. A. lightspring 57 tends to seat the air admission valve 4 and the air admissionvalve 4 is opened by the spring 8 when the toggle-joint members 34 and35 contact with the valve stem 58.

The compressed air is conducted from any suitable source of supply bythe pipe 59 to the air chamber 60 with which the duct 46 communicates.The reference numeral 61 designates an air exhaust pipe through whichVthe exhaust air may be conducted from the exhaust chamber 62 to a pointabove the surface of the water in which the pump is submerged.

The operation of the pump is as follows. Referring to the drawing, theair exhaustvalve 5 is closed and is being held closed by the spring 8.The air admission valve 4 is open and is being held open by the spring 8and the toggle-joint members 34 and 35. rl`he air valve 47 is closed andthe exhaust valve 49 is open and these two valves are being maintain-edin the positions shown by the drawing by the weight of the weight-float56. The water inlet valve 2 is closed and is held closed by its weightand by the pressure exerted upon it within the pump chamber 1. The valve22 is closed and is held closed by the float 26 and the pressure in thepump chamber 1. rlhe pressure of the compressed air on the surface ofthe water in the pump chamber 1 is forcing the water out through thewater discharge pipe 6 and the outitlowing water is keeping the wateroutlet valve 3 open. The several parts occupy the positions shown by thedrawing until the water level in the pump chamber 1 has been lowered tothe. line of flotation of the float 26. lilith a further lowering of thewater level, the Hoat 26 will descend with the lowering water leveluntil the further descent of the float 26 is arrested by the tioatcontacting with the valve lever 24, which is held in its valve closedposition on account of the pressure in the pump chamber l being higherthan the pressure in the pipe 23. As the water level continues to lower,more and more of the float 26 will be left out of water until the weightof the float 26 acting on the valve lever 24 is sutlicient to overcomethe pressure holding the valve 22 closed. rEhe weight of the float 26will then open the valve 22 suddenly and water will be forced throughthe pipe 23 into the fluid chamber 2O of the motor 17 and will force thediaphragm 18, the plunger 13, and the stem 12 to the left, compressingspring 8, rocking the bell-crank lever 9, opening the air exhaust valve5, and bringing the pivot 36 into line with the pivots 37 and The spring40 will swing the toggleljoint members 34 and 35 over against the stem41 with the pivot 36 at the right of a line through the pivots 37 and39. The air admission valve 4 will close, the air pressure in the pumpchamber 1 will be reduced by the exhaust of air therefrom, the wateroutlet valve 3 will close and the wa ter inlet valve 2 will be opened bythe hydraulic pressure outside the pump chamber and water will flow intothe pump chamber to refill the same. As waterl reiills the pump chamber,the float 26 will be elevated, lifting the valve lever 24 and closingthe valve 22. Willen the water level has risen in the pump chambersui'iiciently to submerge enough of the high level float 56 to rock thelever 52, the air valve 47 will be opened and the exhaust valve 49 willbe closed, and the pressure of the compressed air in the fluid chamber45 will bulge the diaphragm 43 and force the head 42 and the stem 41 tothe left far enough to move the pivot 36 to the left of a` line throughexpand and move theplunger 13 and stem 12 tothe right, rocking thebell-crank lever 9,closing the air exhaust valve and swingingthe pivot36 far enough to the left to open the air admission valve 4. The airpressure is now on the pump and the water inlet valve 2 will close, ifit happens to be open, and the water willV open the water foutlet valve3 and be discharged through the water discharge pipe 6, as alreadydescribed. "When the water level in the pump chamber has loweredsufliciently the weightfloat 56 will descend closing the air valve 47and opening the exhaust valve 49 so that the air pressure in the fluidchamber will be reduced when the air exhaust valve 5 is again opened.

The valve lever 24 is provided with a lip 623 to contact with a stop 64to limit fifi the downward movement of the valve lever 24 and the valve22 carried thereby.

A bleed hole 65 is provided at the upper part of the fluid chamber 2()to allow air which may separate from the water toescape and some watermay also escape through this bleed hole, the only point to be observedbeing that the bleed hole should notv` be so large as compared with thearea of the pipe 23 as to materially reduce the pressure in the fluidchamber 20 prior to the full opening of the air exhaust valve 5. Tofacilitate the exhaust of the water from the fluid chamber 2O two ormore openings GG and 67 may afford communication with the pipe 28. Thestem 12 is intended to lit rather nicely in the bore 68 of the web 14through vwhich it passes to prevent the pressure of the air at theinstant of exhaust from exerting a back pressure upon the diaphragm 18and to avoid any interference with the freedom offmovement of thediaphragm 1S, one or more holes 69, ofsuiiicient size to permit freemovement of water therethrough, may be provided to afford communicationbetween the chamber 70 ,and the water in which the pump is submerged.

It will be observed that, with the parts in the positions shown by thedrawing, the pressures upon opposite sides of the diaphragm l43 areequal and that the compressed air is exhausted from the fluid chamber`45 of the fluid pressure motor 44 at the same time that the compressedair is exhausted from the pump chamber 1.

llllhat is claimed is:

1. In a pneumatic pump, the combination with a pump chamber providedwith water inlet and outlet valves, an air admission valve and 'an airexhaust port, of an air exhaust valve located outside of said pumpchamber to control said air exhaust port, means for keeping said airexhaust valve closed against the pressure in said pump chamber, and amotor for opening said air exhaust valve.

2. ln a pneumatic pump, the combination with a pump chamber providedwith water inlet and outlet valves, an air admission valve and an airexhaust Jort, of an air exhaust valve located outside of' said pumpchamber to control said air exhaust port, a spring for keepingsaid airexhaust valve closed against the pressure in said pump chamber, and afluid pressure motor for compressing said spring' and openingsaid airexhaust valve. i

In a pneumatic pump, the combination with a pump chamber provided withwater inlet and outlet valves, an air admission valve and an air exhaustport, of an air exhaust valve located outside of said pump chamber tocontrol said air exhaust port, a spring for keeping said air exhaustvalve closed against the pressure in said pump chamber, toggle-jointmembers for holding said air exhaust valve open, and fluid pressuremotors for compressing said spring and moving said toggle-joint members.i

4. In a pneumatic pump, the combination with a pump chamber providedwith water inlet and outlet valves, an air admission valve and an airexhaust port, of an air exhaust valve located outside or' said pumpchamber to control said air exhaust port, means for holding said airexhaust valve closed against the pressure in said pump chamber, andmeans to actuate said air exhaust valve and said air admission valveaccording to predetermined water levels in said pump chamber.

5. ln a pneumatic pump, the combination with a pump chamber providedwith water inlet and outlet valves, an air admission valve and an airexhaust port, of an air exhaust valve located outside of' said pumpchamber to control said air exhaust port, a bell-crank lever connectedtothe air exhaust valve and a stem, a spring for keeping said airexhaust valve closed against the pressure in the pump chamber, Aa fluidpressure motor for opening-the air exhaust valve, a float in the pumpchamber controlling the operation of' said fluid pressure motor when thewater in the pump chamber has been lowered to a predetermined level,toggle-joint members connected with the air exhaust valve for holding itopen, a second fluid pressure motor for moving said togglejoint memberswhen the water level in the pump chamber has risen to a` predeterminedlevel to permit the air exhaust valve to be closed and to open the airadmission valve.

6. ln a pneumatic pump of the class described, a pump chamber, waterinlet and outlet valves, air inlet `and outlet valves, a fluid pressuremotor connected to said air exhaust valve for operating the latter,means associated with said air exhaust valve for unseating said airinlet valve upon each seating operation of the former, and independentmeans for seating said air admission valve.

7. In a pneumatic pump of the class described, a pump chamber, Waterinlet and outlet valves, air inlet and outlet valves, a iuid pressuremotor connected to said air exhaust valve for operating the latter, astem carried by said air exhaust valve, and toggle joint membersattached to said stem at one end and to a fixed pivot at the other, saidair inlet valve being also provided with a stem, the latter beingdisposed for engagement and operation by said toggle members when saidair exhaust valve is operated in one direction.

8. In a pneumatic pump ot the class described, a pump chamber, Waterinlet and outlet valves, air inlet and outlet valves, a iuid pressuremotor connected to said air exhaust valve for operating the latter, astem carried by said air exhaust valve, toggle joint members attached tosaid stem at one end and to a fixed pivot at the other, said air inletvalve being also provided with a stem, the latter being disposed torengagement and operation by said toggle members when said air exhaustvalve is operated in one direction, said toggle members being moved outot' engagement with said stem upon operation of said air exhaust valvein the opposite direction, and means tor operating said air inlet valvein the reverse direction upon such disengagement.

9. In a pneumatic pump of the class de`- scribed, a pump chamber, Waterinlet and outlet valves, air inlet and outlet valves, a fluid pressuremotor connected to said air exhaust valve for operating the latter, astem carried by said air exhaust valve, toggle joint members attached tosaid stem at onel end and to a fixed pivot at the other,

said air inlet valve being also provided with a stem, the latter beingdisposed 'for engagement and operation by said toggle members when saidair exhaust valve is operated in one direction, means for operating saidair inlet valve in the reverse direction upon such disengagement, and asecond lluid motor for insuring breaking of the toggle joint in theproper direction upon each operation of said air exhaust valve in thedirection first-named.

10. The combination with a pneumatic pump of the class described havingair inlet and exhaust valves, ot a toggle jointed element attached toone of said valves and adapted to engage and operate the other upon abreaking ot' the oint in o-ne direction, and means for operating thevalve to which said element is attached.

ll. rIhe combination with a pneumatic pump ot the class described havingair inlet and exhaust valves, of a toggle jointed elcment attached toone of said valves and adapted to engage and operate the other upon abreaking of the joint in one direction, means lier operating the valveto which said element is attached, and means cooperating withsaidelement for insuring proper breal-:ing ot said joint upon operationof said valve.

12. In a pneumatic pump ot the class described, a pump chamber, waterinlet and outlet valves, air inlet and outlet valves, a fluid pressuremotor connected to said air exhaust valve for operating the latter, anda toggle jointed element associated with said air exhaust valve andadapted when the joint is broken in one direction to engage and operatesaid air inlet valve.

In Witness whereof I hereto ailix my signature.

nonna s. Rooms.

